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Accumulated Other Comprehensive Income/(Loss) (Parenthetical) (Detail) - USD ($) $ in Millions | 6 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017
Foreign Currency Translation Adjustments Attributable to Non-controlling Interests [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Foreign currency translation attributable to non-controlling interests | $ 23 | $ 68
Accounting Standards Update 2016-01 [Member] | Retained Earnings [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Opening balance reclassification | 5 |
Accounting Standards Update 2016-01 [Member] | AOCI Attributable to Parent [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Opening balance reclassification | $ (5) |

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